From: Johan Hovold Date: Wed, 27 Aug 2014 09:55:19 +0000 (+0200) Subject: USB: serial: fix potential heap buffer overflow X-Git-Tag: v3.17-rc3~11^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5654699fb38512bdbfc0f892ce54fce75bdc2bab;p=platform%2Fkernel%2Flinux-exynos.git USB: serial: fix potential heap buffer overflow Make sure to verify the number of ports requested by subdriver to avoid writing beyond the end of fixed-size array in interface data. The current usb-serial implementation is limited to eight ports per interface but failed to verify that the number of ports requested by a subdriver (which could have been determined from device descriptors) did not exceed this limit. Cc: stable Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index eb0e8c6..475723c 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -862,6 +862,11 @@ static int usb_serial_probe(struct usb_interface *interface, num_ports = type->num_ports; } + if (num_ports > MAX_NUM_PORTS) { + dev_warn(ddev, "too many ports requested: %d\n", num_ports); + num_ports = MAX_NUM_PORTS; + } + serial->num_ports = num_ports; serial->num_bulk_in = num_bulk_in; serial->num_bulk_out = num_bulk_out;